Valve



B. D. FlGG Oct. 17, 1950 VALVE FiledA oct, 18, 1946 A Fna? B BASH. 0.FIG@ I uwf/Gttcrneg I ceive the axially inner end of the sleeve I2.

.Patented Oct. 17, 1950 .UNITED STATES ,VALVE Basil D. Figg, EastLansing, Mich.,rassignor to Motor Wheel Corporation, Lansing,lcorporation of Michigan Mich., a

AppI ication October 18, 1946, Serial'No. 704,176

, 1 Y This invention relates to r-valves for regulat ing the now ofgaseous fuels to a burner, and particularly to such valves for use ingas burning cooking'ranges. i y i Valves of the type mentionedare-usually of the rotary plug type. Such .valves vare capable ofrotationa-bout 90, but due to ,their rpeculiar, characteristics, onlyalimited partiof that roi tation is employed "for regulating 'the-flow'of fuel. ,Henca the .adjustment of the valves-to provide apredeterminedflow of fuel is extremely critical. The principal object ofthe present invention is to provide a Valve'of the lrotary plug type inwhich substantially the `entire range of rotary movement is utilized inregulating the flowof fuel. f'

which the rate of ow of fuel 4is substantially proportioned to thedegree of rotation of the valve between its opened and closedpositions.

Another object is Vvto provide vanvalve having these characteristics andin which a positiv'eqshut off for Vfuel is provided.

A still further object whichgvwhen moved' from' closed to openedposi'-tion, opensjrapidly. and Vthen closesslowly to regulate the 'ow of fuel.Y A

These objects. will more fully appear 'in the followingspecication whenread Yin connection with the accompanying drawings, wherein:

'I vFigure 1 is a cross-sectional view of a valve iew Another object istompr'ovid'e Sucha valve istorprovide such ajvalve A5 claims. (o1.251;-92)

tive positions of the valve body, valve plug and The valve body Il) hasa bore extending axially therethrough. The axially'outer end of the boreI4 is tapered toward the inner end to receive the tapered plug IIsnugly. The axially inner end of the 4bore is reduced in diameter at I5to re- The valve is associatedV metering plug I6 is threaded into theVaxially inner end of the valve body. Themetering plug I6 is providedwith a metering orifice II, which limits the maximum quantity of gaswhich can Vpass through the valve.

At one side of the valve body is a tubular neck I8 by means of which thevalve can be connected to a.v gas main. The neck I8 has a cylindricalpassageway I9 therethrough opening into the bore in the valve body. Aplate 20 having a central opening therein overlies, andis Vconnected to,the axially outer end of the Valve body.

. 'The plug II is tapered at its axially inner `end to fit snugly withinthe tapered portion -of the bore in the valve body. The other end of theplug hasva shaft 2| to which a vhandle 22 flor rotatingf the plugisattached. A coiled compression spring 23 surrounds the shaft '2| Aandurges the plug into tight engagement with theV tapered portion of thebore in the'valve body. The axially inner end of the plug II is providedwith an axially extending recess 24 of cylindrical shape. A slot iscutthrough the side wall of the recess.l `This slot has a rectangularportion 25 and a circumferentially extending portion 2B. The latter isgenerally triangular, elongated ina circumferential direction (seeFigures 2 and 6 to 8). The two portions of the slot'are arranged so thatas the plug visrotated the slot will move across the inner end of thepassageway I9. l

4 The sleeve I2 is cylindrical, and has an vaxial passageway V28therethrough. TheA axially inner end of the sleeve is seated in theportionlof the bore and fxedftherein by means of a set screw 2! threadedinto the side of the valve body.

The sleeve I2 is a relatively tight rotating t within the recess 24 inthe plug II. The axially outer end of the sleeve extends past thepassagewayl I9. A deep notch 29 is cut in the wall of the `sleeve at theaxially Vouter end of the sleeve. The axially inner edge of the notch 29is inclined (see Figures 3 and 6 to 8 especially) and is indicated bynumeral 3|l. The Sleeve I2 is arranged within the valve body asA thatthe edge of the notch 29 adjacent the near side of the passageway I9 isspaced angularly about 20 way I9.

therefrom. y

Figures 6 to 8 illustrate "diagrammatically three of the many ypositionsof the plug Il relative .to the valve body and sleeve. When theparts'are in the position shown in Figure 6, the slot in the valve plugoverlies a portion of the notch 29 but does not registerv with thepassage- In this position the valve is .closed because gas cannot leavethe `passageway I9.

Fs. Rotation of the valve plug toward open position brings therectangular portion 25 of the slot into registry with the inner end ofthe passageway. An angular movement of approximately 45 opens the valveto it's maximum opening (see Figure 7). Gas leaves the passageway I9through that part of the slot in the valve plug which Yregisterstherewith, ows along the portion 26 of the slot which lies between thepassageway l9 and notch 29 and enters the sleeve through those parts ofthe slot and the notch 29 which are in registry. The area of the slotthrough Which gas iioWs is cross-hatched in Figure 7.

Further rotation of the valve plug in the same direction will leave arelatively large part of the passageway I9 and slot in registry, butwill immediately begin to reduce the area of the slot that is inregistry with notch 29. That is so because the portion 28 of the slot istapered and inclined in the opposite direction. Thus it will be evidentthat the quantity of gas can be reduced by'rotating the plug past itswide open position.

Figure 8 illustrates diagrammatically the position of the plug in simmerand stop position. In this position the only gas that can pass throughthe valve is that which can pass between the tip of the portion 28 ofthe slot and the edge of the notch 29. A suitable stop (not shown)prevents further rotation of the valve in this direction.

Reversing the direction of the rotation of the valve plugfrst increasesthe gas flow and then shuts it 01T.

It will be evident that by reversing the arrangement of the sleeve andplug slot, or by arranging the plug so that it can be turned in theopposite direction to move between opened and closed position, meteringcan be effected all the way between opened and closed positions. It ispreferred, however, to first fully open the valve and then slowly closeit to meter the fuel, because this insures positive lighting of theburner from thepilot light usually provided.

lFrom the foregoing it willbeseen that the present invention provides anovel valve for metering gaseous Ifuel in which regulation of the fuelis accomplished throughout a degree of rotation of approximately insteadof the usual 20 to 25. Thus more accurate fuel regulation isaccomplished. The scope of the invention is indicated in the appendedclaims.

I claim: Y

1. A metering valve for gaseous fuel comprising a tubularvalve-bodyhaving a fuel inlet port in a, side thereof, a non-rotatablesleeve in said valve ybody .coaxial therewith, said sleeve having aninlet vport therein spaced angularly from said iirst mentioned port, theinlet port in said sleeve having two adjoining edges which make an angletherebetween of less than and a rotatable plug coaxial with said valvebody, said plug having a tubular` wall located between the valve bodyand the sleeve, said wall having an opening therethrough of greaterextent angularly of said plug than the distance between said ports, thewidth of said opening being greater at one angular extremity than at theother, the opening in the tubular wall of said plug having two edgeswhich form an acute angle therebetween and which intersect both of thesaid edges in the sleeve inlet port when the valve is set for wide openposition.

2. A metering valve as dened in claim 1 wherein the width of saidopening in said plug Wall decreases substantially uniformly from a pointadjacent the wider end to the other.

3. A'metering valve for gaseous fuel comprising a tubular valve bodyhaving a fuel inlet port in a side thereof, a sleeve in said valve bodycoaxial therewith .and spaced radially therefrom, said sleeve having aport therein spaced angularly from said rst mentioned port and beingflxedly connected to said valve body, the port in said sleeve having aninclined edge extending partially around said sleeve and a second edgemaking an angle of lessthan 180 with the inclined edge, and a rotatableplug coaxial with said valve body, said plug having a tubular wallbetween said valve body and said sleeve, said plug wall beingfprovidedwith an opening therein extending angularly partially therearound andbeing inclined oppositelytosaid inclined edge ofthe port in the sleeve,the opening in the plug wall having two edges which form an acute angle,the inclined and second edges of the port in said sleeve being out ofparallelism with both edges of the plug opening in all relativepositions of the sleeve and plug.

4. A metering valve as defined in claim 3 wherein the opening in theplug wall decreases in width from one| angular extremity to the other.

`5. A metering valve as defined in claim 4 wherein the opening in theplug includes an axially extending rectangular portion joining theopening in the plug wall at its widest angular extremity.`

' BASIL D. FIGG.

REFERENCES CITED The following references are of record in the le ofthis patent:

Y UNITED STATES` PATENTS Number

